.da{
    margin: 0 auto;
}
.da img{
  height: 80px;
}
.p1{
    color: rgb(79, 155, 237);
}
header {
  background-color: #007BFF;
  color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 10px;
}
.navbar {
  background-color: #4c9ed9;
  overflow: hidden;
  
}
.navbar a {
  float: left;
  display: block;
  color: white;
  text-align: center;
  padding: 14px 20px;
  text-decoration: none;
  margin-left: 100px;
}
.navbar a:hover {
  background-color: #ddd;
  color: black;
}
.navbar a.active {
  background-color: #2c6da0;
  color: white;
}
  nav ul {
    list-style: none;
    display: flex;
  }
  nav ul li {
    margin-right: 20px;
  }


  
/* 主内容样式 */
.banner {
  overflow: hidden;
  background:url(./7.png);
  height: 84px;
  width: 980px;
  margin-left: 200px;
 

}

.content {
  display: flex;
}

.about-us {
  width: 200px;
  border: 1px solid #ccc;
  padding: 10px;
}
.about-us h2 {
  margin-top: 0;
  color: #003366;
}
.menu-item {
  padding: 10px;
  cursor: pointer;
  border-bottom: 1px dashed #ccc;
}
.menu-item:last-child {
  border-bottom: none;
}
.menu-item.selected {
  background-color: #4c9ed9;
  color: white;
}

.main {
  width: 80%;
  padding: 10px;
}
.y1{
  color: #478dbf;
}

/* 底部样式 */
footer {
  background-color: #f8f9fa;
  padding: 20px;
  text-align: left;
}

footer ul {
  list-style: none;
  display: flex;
  justify-content: right;
  padding: 0;
}

footer ul li {
  margin-right: 20px;
}

footer ul li a {
  text-decoration: none;
  color: rgb(79, 155, 237);
}
.p11{
  text-align: right;
  color: rgb(79, 155, 237);
}

